Improved street-lamp



. v 2 Sheets-Sheet 1,.

T- T. MARKLAND, Jr.

Street Lamp.

No. 55,686. Patented June "19, 18 66.

N. PEIERS moiimognphen Waillinglon. an

2 Sh T. T. MARKLAND, Jr; Bets Sheet 2 Street Lamp.

No. 55,686., Patented Ju ne'19, 1866.

'M'ind's es [3: V8 n Z0 r.-

N, PETERS. Flmno-unm aw, Wnilum: lllllll C.

UNITED STATES PATENT OFFICE...

THOS. T. MARKLAND, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED STREET-LAMP.

Specification forming part of Letters Patent No. 55,686, dated June 19,1866.

To all whom it may concern.-

Be it known that I, THOMAS T.1\[ARKLAND, Jr., of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and useful1m provement in Street-Lamps; and I do hereby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings,and to the letters of reference marked thereon.

The nature of my invention and improvement will be understood by thefollowing description In the accompanying drawings, Figure 1 is a sideelevation of the improved lamp. Fig. 2 is a vertical section of thesame. Fig. 3 is a top view of the globe A. Fig. 4 is a view from theunder side of the roof E and the reflector H in connection. Fig. 5 is'aperspective view of the reflector H. Fig. 6 is a side elevation of theflame-screen and reflector F.

Like letters in all the figures indicate the same parts.

Aisa-glass globe which surrounds the burner B on the gas -pipe (J. It isopen below and above, and has annular rims or flanges a a, in which arevertical grooves Z) Z) to provide for connecting it with the conicalbase D and roof E, there being lugs 0 on the base and (Z on the verticalrim E of the roof, which are passed through said vertical groovesrespectively, and by a partial turn of the globe the lugs 0 take hold onthe upper edge of the rim a; and by turning the roof E partly around,after the lugs (Z have been passed through the grooves I) of the rim aof the globe, the lugs catch beneath the rim, and thus the globe, base,and roof are held tightly together.

The base D has a socket, e, which fits on the lamp-post F. G is a doorto said base, by which access to the burner B is obtained. There areholes f in the sides of the base to admit air for supply of combustion.

The conical plate H, whose socket g tits on the burner 1), serves thedouble purpose of screening the flame of the burner from the wind and ofreflecting the light against the reflector H, which is ordinarily thowudown on the top of the lamp-post andis consequently lost. The said plateH is shown detached from the burner in Fig. 6.

1 is a stop'cock,eonnccted in the usual manher with the gas-pipe (J.

The reflector H tits 011 the seat H, which projects from the under sideof the roof E, and is held in place by means of the flange h on theshort tube J, that tits in the central tube, K, connected with the roofE,as seen in Fig. 2. By this means the reflector is expeditiouslydetached from the lamp for cleaning when required, as seen in Fig. 5.

There is a cap, L, to the root E, as seen in Figs. 1 and 2. Projectingfrom the under side there is a short tube, 2', which tits in the centraltube, K, of the root, to provide for readily attaching and detaching ofthe cap.

In the bottom of the basej there are pertbra tions Z, for the admissionof cold air, and there are slots 1 between the base or square part ofthe cap-piece and the conical root the same for its exit and the exit ofthe heated air, which ascends from the burner B through the centraltube, K. This arrangement is to prevent the heat from the burner beingthrown against the sides of the globe A. The globe is also protected bya current of air being created by means of the holes or perforations finthe base D and the slots k of the roof E, which are beneath its conicalpart and its annular projection E, the excess of air which passesthrough said perforation over that which is necessary to consumption bythe burner being sufficient to keep the globe cool, so as to preventbreaking from sudden expansion and contraction.

When the lamp is situated at a corner of two streets 1 make two sides ofthe base of the cap L open,and have-slides M M, with perforations,forming the names of the streets,so that from the light within the namesare indicated at night; but when the lamp is not at the corner but asingle slide is perforated. v The slides may be perforated to indicate ahotel or other buildings.

I provide for preventing water, caused by rain, running into the base 1)from the sides of the globe A by means of the annular projection m onthe lower end of the globe. This projection or flange I make solid orfast to the globe ordinarily; but it may be made of tin or sheet-iron ifdesired, and sprung into a shallow groove in the neck of the globe, andsecured by means of cement.

The water is prevented running into the lamp at the upper end of theglobe by means of the roof E, as represented in Figs. 2 and 3. Insteadof constructing the globe with the grooved rims (I, and a the lugs maybe on it and the rims on the base and roof, if found the moreconvenient.

It will readily be seen that the heat will be carried up from the burnerthrough the central tube, K, so as not to heat the globe A in consequence of the currentof cold air which passes through the perforationin the base D,passing up the inner periphery of the globe, as indicatedby the arrows, the central draft of the heated air being made morecomplete by the draft of cold air through the bottom of the cap L, asabove described. It will also be seen that by means of the reflector Hmuch light is thrown outward from the lamp which by the ordinaryconstruction of street-lamps is thrown upward; hence a great saving oflight, tending to economy in the use of gas, is attained.

Instead of constructing the base D of conical form it may be made of anyother form when desired. It may sometimes be preferred to have merely aflat plate connected in the same manner as described, or otherwise, withthe post and globe.

By constructing the lamp as above described, so that the differentpieces may be slipped together instead of putting the parts together bymeans of screws and bolts, much economy is effected in making it,besides saving much time in attaching and detaching of the several partsfor cleaning or otherwise.

Having thus fully described the construction and operation ofmyimprovementin streetlamps, what I claim therein as new, and desire tosecure by Letters Patent, is-

1. The combination of the screen and reflector H with the burner B andreflector H, substantially in the manner and for the purposes set forth.

2. The combination of the globe A with the base 1) and roof E, when saidparts are constructed and arranged in relation to each othersubstantially as described, and for the purposes set forth.

3. The combination of the reflector H with the roof E, reflector H, andburner B, substantially as described, and for the purposes set forth.

4. Constructing the globe A with the annular projection m, for turningthe water from the lamp, substantially as specified.

5. Constructing the base D with perforations f and the roof E with theslots or openings k, for causing a current of cold air to flow over theinterior surface of the globe A, to counteract the heat from the burnerB, substantially as described, and for the purpose set forth.

6. The combination of the cap L with the central tube, K, and the burnerB, when constructed and arranged to operate in relation to the draft ofsaid tube substantially as described.

7. The perforated names in the sides of the cap L, in combination withthe burner B, substantially as described, and for the purpose specified.

In testimony that the above is my invention I have hereunto set my handand affixed my seal this 19th day of April, 1866.

p Tues. MARKLAND, JR. [L, s.

